package bite;

import java.math.BigInteger;
import java.util.Scanner;

/**
 * Creared with IntelliJ IDEA.
 * Description:【三角形】给定三条边，请你判断一下能不能组成一个三角形。
 * User:yxd
 * Date:2022-05-22
 * Time:15:28
 */
public class Day27_2 {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        while(input.hasNext()){
            String a1 = input.next();
            String b1 = input.next();
            String c1 = input.next();
            BigInteger a = new BigInteger(a1);
            BigInteger b = new BigInteger(b1);
            BigInteger c = new BigInteger(c1);
            //两边之和大于第三边
            if(a.add(b).compareTo(c) <= 0 || a.add(c).compareTo(b) <= 0 || c.add(b).compareTo(a) <= 0){
                System.out.println("No");
            }else{
                System.out.println("Yes");
            }
        }
    }
}
